From patchwork Tue Oct 8 03:48:54 2013 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Josh Wu X-Patchwork-Id: 3000251 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 0C9A59F245 for ; Tue, 8 Oct 2013 03:51:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 1B4E72011F for ; Tue, 8 Oct 2013 03:51:44 +0000 (UTC) Received: from casper.infradead.org (casper.infradead.org [85.118.1.10]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id F19842010C for ; Tue, 8 Oct 2013 03:51:42 +0000 (UTC) Received: from merlin.infradead.org ([2001:4978:20e::2]) by casper.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VTOKH-0008H0-VN; Tue, 08 Oct 2013 03:51:14 +0000 Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1VTOKB-0000Ei-72; Tue, 08 Oct 2013 03:51:07 +0000 Received: from nasmtp02.atmel.com ([204.2.163.16] helo=SJOEDG01.corp.atmel.com) by merlin.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1VTOK5-0000DD-G1 for linux-arm-kernel@lists.infradead.org; Tue, 08 Oct 2013 03:51:02 +0000 Received: from apsmtp01.atmel.com (10.168.254.31) by sjoedg01.corp.atmel.com (10.64.253.30) with Microsoft SMTP Server (TLS) id 14.2.347.0; Mon, 7 Oct 2013 20:58:07 -0700 Received: from shaarm01.corp.atmel.com (10.168.254.13) by apsmtp01.atmel.com (10.168.254.31) with Microsoft SMTP Server id 14.2.347.0; Tue, 8 Oct 2013 11:55:19 +0800 From: Josh Wu To: , Subject: [PATCH 1/3] iio: at91: ADC start-up time calculation changed since at91sam9x5 Date: Tue, 8 Oct 2013 11:48:54 +0800 Message-ID: <1381204136-32322-2-git-send-email-josh.wu@atmel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1381204136-32322-1-git-send-email-josh.wu@atmel.com> References: <1381204136-32322-1-git-send-email-josh.wu@atmel.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20131007_235101_806250_F249A07F X-CRM114-Status: GOOD ( 14.58 ) X-Spam-Score: -2.1 (--) Cc: thomas.petazzoni@free-electrons.com, mark.rutland@arm.com, linux-iio@vger.kernel.org, nicolas.ferre@atmel.com, b.brezillon@overkiz.com, Josh Wu , maxime.ripard@free-electrons.com, plagnioj@jcrosoft.com, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Since in at91sam9x5, sama5d3x chip. the start up time calucation is changed. This patch can choose different start up time calculation formula for different chips. Signed-off-by: Josh Wu Acked-by: Maxime Ripard --- drivers/iio/adc/at91_adc.c | 53 ++++++++++++++++++++++++++++++++++++++------ 1 file changed, 46 insertions(+), 7 deletions(-) diff --git a/drivers/iio/adc/at91_adc.c b/drivers/iio/adc/at91_adc.c index 0f16b55..cee04a4 100644 --- a/drivers/iio/adc/at91_adc.c +++ b/drivers/iio/adc/at91_adc.c @@ -40,6 +40,9 @@ (writel_relaxed(val, st->reg_base + reg)) struct at91_adc_caps { + /* startup time calculate function */ + u32 (*calc_startup_ticks)(u8 startup_time, u32 adc_clk_khz); + struct at91_adc_reg_desc registers; }; @@ -434,6 +437,45 @@ ret: return ret; } +static u32 calc_startup_ticks_9260(u8 startup_time, u32 adc_clk_khz) +{ + /* + * Number of ticks needed to cover the startup time of the ADC + * as defined in the electrical characteristics of the board, + * divided by 8. The formula thus is : + * Startup Time = (ticks + 1) * 8 / ADC Clock + */ + return round_up((startup_time * adc_clk_khz / 1000) - 1, 8) / 8; +} + +static u32 calc_startup_ticks_9x5(u8 startup_time, u32 adc_clk_khz) +{ + /* + * For sama5d3x and at91sam9x5, the formula changes to: + * Startup Time = / ADC Clock + */ + const int startup_lookup[] = { + 0 , 8 , 16 , 24 , + 64 , 80 , 96 , 112, + 512, 576, 640, 704, + 768, 832, 896, 960 + }; + int i, size = ARRAY_SIZE(startup_lookup); + unsigned int ticks; + + ticks = startup_time * adc_clk_khz / 1000; + for (i = 0; i < size; i++) + if (ticks < startup_lookup[i]) + break; + + ticks = i; + if (ticks == size) + /* Reach the end of lookup table */ + ticks = size - 1; + + return ticks; +} + static const struct of_device_id at91_adc_dt_ids[]; static int at91_adc_probe_dt(struct at91_adc_state *st, @@ -657,15 +699,9 @@ static int at91_adc_probe(struct platform_device *pdev) ret = -EINVAL; goto error_disable_adc_clk; } + ticks = (*st->caps->calc_startup_ticks)(st->startup_time, adc_clk_khz); /* - * Number of ticks needed to cover the startup time of the ADC as - * defined in the electrical characteristics of the board, divided by 8. - * The formula thus is : Startup Time = (ticks + 1) * 8 / ADC Clock - */ - ticks = round_up((st->startup_time * adc_clk_khz / - 1000) - 1, 8) / 8; - /* * a minimal Sample and Hold Time is necessary for the ADC to guarantee * the best converted final value between two channels selection * The formula thus is : Sample and Hold Time = (shtim + 1) / ADCClock @@ -742,6 +778,7 @@ static int at91_adc_remove(struct platform_device *pdev) #ifdef CONFIG_OF static struct at91_adc_caps at91sam9260_caps = { + .calc_startup_ticks = calc_startup_ticks_9260, .registers = { .channel_base = AT91_ADC_CHR(0), .drdy_mask = AT91_ADC_DRDY, @@ -753,6 +790,7 @@ static struct at91_adc_caps at91sam9260_caps = { }; static struct at91_adc_caps at91sam9g45_caps = { + .calc_startup_ticks = calc_startup_ticks_9260, /* same as 9260 */ .registers = { .channel_base = AT91_ADC_CHR(0), .drdy_mask = AT91_ADC_DRDY, @@ -764,6 +802,7 @@ static struct at91_adc_caps at91sam9g45_caps = { }; static struct at91_adc_caps at91sam9x5_caps = { + .calc_startup_ticks = calc_startup_ticks_9x5, .registers = { .channel_base = AT91_ADC_CDR0_9X5, .drdy_mask = AT91_ADC_SR_DRDY_9X5,